Correct wiring for a Battery Monitor

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Cheeky Girl

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Hi
I am wanting to add a Battery monitor - Victron BMV712 to monitor my 2 service batteries and an Engine battery

My thought about the wiring are below.
Remove the cables marked in yellow and add the blue ones.
Granted the blue to engine will be connected directly into the shunt.

Should the Positive supply to the shunt go to the "S" batteries positive?

Thanks
 

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Happilyoverforty said:
I am wanting to add a Battery monitor - Victron BMV712 to monitor my 2 service batteries and an Engine battery

My thought about the wiring are below.
Remove the cables marked in yellow and add the blue ones.
Granted the blue to engine will be connected directly into the shunt.

Should the Positive supply to the shunt go to the "S" batteries positive?
Click to expand...

Your diagram is incorrect. The shunt needs to connect directly to the negative of the service batteries, with nothing else connected to the battery negative - in this way all of the current in and out of the service batteries has to pass through the shunt. So you could put the shunt between batteries U and T.

The positive supply to the shunt should be connected to the positive of either battery S or battery T.

The second positive to the shunt should be connected to battery U, so that the monitor can show the voltage of the engine battery.

You'll also need to rewire the common negative of all the consumers so that it is connected to the engine side of the shunt (at the moment your diagram shows it connecting to battery S).

And you seem to have a battery charger; again, the negative needs to be re-wired to engine side of the shunt (at the moment your diagram shows it connecting to battery S).
 
The diagram is wrong and the boat is wired wrong too.

Remove the link cable that goes from T to U, from U and connect it to the shunt battery connection.

From battery S, remove the cables that go to the bow thruster battery mains charger and the electrical panel and connect them to the load terminal of the shunt.

Connect a new cable from U to the shunt load terminal.
 
Last edited:
PaulRainbow said:
The diagram is wrong and the boat is wired wrong too.

Remove the link cable that goes from T to U, from U and connect it to the shunt battery connection.

From battery S, remove the cables that go to the bow thruster battery and the electrical panel and connect them to the load terminal of the shunt.

Connect a new cable from U to the shunt load terminal.
Click to expand...

Isn't that basically what I suggested? But you didn't mention the battery charger...
 
pvb said:
Isn't that basically what I suggested? But you didn't mention the battery charger...
Click to expand...

Basically, yes. But i have made the clear distinction that there should be no connections made to the negative of battery S.

What is it that you think is a battery charger ?
 
PaulRainbow said:
Basically, yes. But i have made the clear distinction that there should be no connections made to the negative of battery S.

What is it that you think is a battery charger ?
Click to expand...

Item C in the diagram; it has mains connected to it and has wires to the service battery.

I didn't think there was a bow thruster battery on the diagram, but I may have missed it.
 
pvb said:
Item C in the diagram; it has mains connected to it and has wires to the service battery.

I didn't think there was a bow thruster battery on the diagram, but I may have missed it.
Click to expand...

Hah, looked like a battery when i first looked, but yes, i see it's a mains charger. ?
Will edit original post.
 
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